Hi,
Earlier, I watched (on replay) The Simpsons (Ch4, 12:30) and the volume was extremely low. The adverts and other channels were as loud as usual, but as I had to turn the volume up on my AVR so high to hear the actual programme, one had to be hyper ready to mute the volume during the adverts.
I believe this is also related to UPC’s mess of a Dolby Digital implementation, as the programme was no doubt in DD (it’s a modern episode on an HD channel), but of course your Replay doesn’t support that and strips the surround info, somehow leading to this volume issue. That’s my guess as to why, anyway.
The Horizon box didn’t have such a major issue with this.